Drill-bit



(No Model.) R KBB DRILL BIT. N0.451,292. PatentedApr. 28,1891. 17u91- 2 lfffi w nulwmlunlilw C WIM/5835s: r f 5y l l .l r

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ArnNr DRILL-BIT.

SPECIFICATION forming part of Letters Patent No. 451,292, dated April 28, 1891. Application filed December 12, 1889. Serial No. 333,555. (No model.)

To @ZZ whom, t may concern:

Be it known that I, ROBERT McKEE, residing at Meeker, Rio Blanco county, and State of Colorado, have invented a new and useful Improvement in Drills, of which the following is a speciication.

My invention is an improvement in drills employed for boring' Artesian wells and others of analogous kinds. It is more particularly an improvement in that class of drills having an attachment in the form of arms or teeth adapted to be projected laterally for enlarging the cutting-face of the drill when required in order to increase the diameter of the well.

The construction and operation are as hereinafter described with reference to accompanying drawings, in which- Figure l is a side View of my improved drill. Fig. 2 is another side View, the drilltube coupling being removed. Fig. 3 is a central longitudinal section of the drill on line 3 3, Fig. 1. Fig. 4 is a cross-section on line 4 4, Fig. 3. Fig. 5 is a perspective view of the adjustable drill attachment.

The body A of the drill proper is Wedgeshaped or tapered in the usual way and provided with a cylindrical shank B, which is reduced in diameter and screw-threaded from end to end. A passage a, Fig. 3, extends through the shank B lengthwise and centrally thereof, and is deflected laterally to its termination on one of the flattened sides of the drill proper A. This passage serves for withdrawing (by means of a pump) the water, sand, mud, chipped rock, &c., accumulated in the bore while drilling.

The drill A has a lengthwise groove o on opposite sides, and it will be noted, Fig. "l, that such grooves gradually decreasein depth from the upper end to the point of the drill.

The drill attachment, by whose vertical adj ustment the point may be increased in width,

consists, Fig. 5, of an annular collar O, having two opposite pendent extensions or arms C C', which are formed in one rigid piece with said collar and adapted to fit loosely, and thus to slide freely in the aforesaid grooves b o. The points of these arms are broadened and also tapered or Wedge-shaped, corresponding to the drill proper. lA sleeve D screws on the d rill-shank B, and is threaded exteriorly, save at the lower end,which is provided with a circumferential lateral flanged, Fig. 3. The opening in theV collar O ofthe aforesaid attachment is sufciently large to receive the threaded portion of the sleeve D, and has a rabbet in its under side, in which the aforesaid flange CZ tits. An internallythreaded sleeve-coupling E screws on sl'eeve D, so that the collar Cof the drill attachment is confined between it and the flange d, as

shown. The couplingE connects the drill to the drill-tube, of which a portion is shown by dotted lines at fr, Fig. 3,and it is keyed to the sleeve D at e, so that both may be rotated together. Allthe screw-joints of the drill-tube are similarly keyed together.

A band f encircles the head of the drill A and aids in confining the arms C C in the grooves h b.

Wells drilled in any medium save solid rock require a casing to prevent the sides caving in; but to adapt it to receive casingsections of uniform size the bore requires to be enlarged at certain points, and for this work my drill attachment is intended and adapted. To adj ust the said attachment, and thus practically widen the Working face or edge of the drill, the drill-tube is rotated, (to the right,) and thereby the sleeve D is screwed farther down on the drill-shank B, which movement forces the drill attachmentC C C farther down, so that the arms C C are spread farther apart, thus Widening the face or point of the drill. By rotating the drilltube in the opposite direction (tothe left) the attachment Will be drawn upward, and the arms C C thereby retracted into the deeper portions of the grooves b @which practically narrows the face of the drill to that extent. The drill and its attachment can then be drawn up through the casing, leaving the well complete, with a casing` of uniform diameter throughout.

What I claim is- 1 The combination, with the drill proper A,having the reduced and exteriorly-threaded shank B made integral therewith, of the attachment consisting of an annular portion and pendent arms constructed integrally, the said collar fitting loosely on the drill-shank and the arms extending down on the sides of the drill, and the tubular coupling E, Which screws on the drill-shank and serves to conneet with the drill-tube, as shown and described.

2. The combination, with a drill proper having` a threaded shank and grooved sides, of a drill attachment havin-g opposite arms or teeth extending down the sides of the drill, a sleeve D, adapted to screw up and down on the shank and connected with the said attachment, whereby they may rotate independently, but are raised together, and a coupling immovably secured to the sleeve D for connecting it With the drill-tube,substan tially as shown and described, whereby the rotation of the latter serves to adjust the attachment higher or lower, as specified.

Attest:

JOHN L. NooNAN, W. W. GAW,

J. R. BURGETT. 

